[HIVE-11566] Hybrid grace hash join should only allocate write buffer for a hash partition when first write happens

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.2.0
• Component/s: Hive
• Assignee: Wei Zheng
• Reporter: Wei Zheng
• Created: 14/Aug/15 20:28
• Updated: 01/Sep/15 23:09
• Resolved: 01/Sep/15 23:09

Description

Currently it's allocating one write buffer for a number of hash partitions up front, which can cause GC pause.

It's better to do the write buffer allocation on demand.

Issue Links

• duplicates: HIVE-11587 Fix memory estimates for mapjoin hashtable